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Command Processing
114 C141-C013
2.6 Power Condition
The HDD has three power condition states: Active, Active_Wait, and Stopped.
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Active_Wait
Stopped
Active
NOTIFY
(ENABLE SPINUP)
STOP
STOP
START
• Active_Wait state
In this state, the HDD is waiting for motor start with NOTIFY (ENABLE
SPINUP). When the HDD receives a command that cannot be executed due to
"not ready" during this state, the HDD reports the CHECK CONDITION status.
In this case, "NOT READY [= 02]/LOGICAL UNIT NOT READY, NOTIFY
(ENABLE SPINUP) REQUIRED [= 04-11]" is reported as sense data.
When the HDD receives NOTIFY (ENABLE SPINUP), it starts the motor.
The HDD enters the Active state after the motor is successfully started.
When the HDD receives a command that cannot be executed due to "not
ready" while starting the motor, the HDD reports the CHECK CONDITION
status. In this case, "NOT READY [= 02]/LOGICAL UNIT IS IN PROCESS
OF BECOMING READY [= 04-01]" is reported as sense data.
When the HDD receives the STOP command, it enters the Stopped state.
• Active state
In this state, the drive is ready.
• Stopped state
In this state, the HDD is waiting for the START command. When the HDD
receives a command that cannot be executed due to "not ready," the HDD
reports the CHECK CONDITION status. In this case, "NOT READY
[= 02]/LOGICAL UNIT NOT READY, INITIALIZING COMMAND
REQUIRED [= 04-02]" is reported as sense data. When the HDD receives
the START command, it enters the Active_Wait state.